Mathematics – Logic
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1013n&link_type=abstract
(International Union of Geological Sciences, Australian Academy of Sciences, Australian National University, et al., S. R. Taylo
Mathematics
Logic
3
Breccia, Geochemistry, Lunar Composition, Lunar Crust, Lunar Evolution, Lunar Rocks, Selenology, Anorthosite, Lithium, Petrology, Ytterbium
Scientific paper
The geochemistry of anorthositic clasts from an Apollo 16 breccia 67016 is studied in order to investigate the role of these rock types in lunar crustal evolution. The samples have aluminous, alkali-poor compositions and varied FeO and MgO contents. Three compositional groups are recognized. One group is poor in mafic constituents with low abundances of lithophile trace elements typical of lunar anorthosites, while the other two groups are more mafic and are distinguished from each other by FeO/MgO ratios greater than one in the case of ferroan noritic and less than one in the case of magnesian troctolitic. These mafic-enriched varieties have considerably higher lithophile element concentrations, at levels similar to that of the bulk lunar crust. The ferroan noritic clasts may represent a fundamental type of igneous rock in the lunar crust which has not been widely recognized.
Norman Marc D.
Taylor Stuart R.
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